Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ce4fa44a511f0b…

MALICIOUS

PDF

161.1 KB Created: 2021-06-10 17:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0e021df8a67953fce664aac4714fcb5f SHA-1: aacae901e96d0e255593407c09544e7509799fb5 SHA-256: 26ce4fa44a511f0b338666b8d87acc48c57ada1aa5fba9fe2d3fa152e1ea71a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs and the heuristic findings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=natural+resources+reading+comprehension+pdf PDF link annotation
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaf1636ee9---jisenawipuk.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/36354167551.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/refonuxobizinatogazewo.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/nolikasetumetuwepe.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bhvss5spmh4df17ushec28rjdu/60078614088.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70c427d1a---nogiwotodoboga.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/94cc7e14aa85ba7c47df6548af40d5b8/wefugugozolap.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/3ulglb0l60qhdtquags73q0jt1/zamogepigumexutid.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f86a6d966f6cd862f528250758702790/sozemumoxaritenebuwopa.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/77004949736.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cdf3e7cfc---pezotudug.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aac96e2b4bb---59491858440.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9323da8f646485206b4664e3406b2fab/vibenepijifadarinis.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/5il3gfol8pq7lso5eia3k2emc0/77296617845.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/kowabola.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20733 5536 bytes
SHA-256: af775b11c54b0bc8b62703ae3f13735e175481f770f0df9bf5f1dbd66577909b
font_01_sfnt_off000219e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x219E1 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off00022543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22543 11448 bytes
SHA-256: dfc23da42334683860cd80c58ebb51f40f5797961756200b9fcdb34a7eb6c905
font_03_sfnt_off00024c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C6D 13564 bytes
SHA-256: 1df22ed9e923a950eae18812e980f59fec056591e2c1852d98a6917284bb6878

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